The first goal of this study is to identify any possible contributions of the BAH phenotypes and genotypes to the pathophysiology of PCOS, a yet unknown factor in the etiology of this multifaceted disorder. The second goal is to perform a comparative analysis of the expression of large sets of genes in cells of these patients using gene arrays and other genetic analyses. This study will generate important information about the molecular pathways that are affected in this subgroup of patients with PCOS. Thirdly, this study will also allow for the collection of DNA from affected and non-affected relatives of the patients to perform genetic studies and identify causative genetic defects. Finally, the study is expected to lead to new diagnostic and therapeutic methods for at least certain forms of PCOS.